标题： 揭示$α$和$β$-弛豫在静水压缩金属玻璃中的作用 显示英文标题

标题： Revealing the role played by $α$- and $β$-relaxation in hydrostatically compressed metallic glasses

摘要： 任何金属玻璃的性质都由微观的持续弛豫过程控制。 尽管这些过程对温度的响应已被广泛记录，但由于实验上的复杂性，它们的压力依赖性却知之甚少。 通过结合快速差示扫描量热法、X射线衍射和高压技术，我们从一系列静水压缩的Vit4玻璃中$\alpha$-和$\beta$-弛豫的不同压力响应中确定了最近发现的压力诱导再活化的原因。 虽然局部的$\beta$-弛豫促进再活化，并与一个不依赖于施加压力的松散原子排列有关，而集体的$\alpha$-弛豫则触发密度驱动的有序过程，从而促进稳定性。 然而，后一个参数不能仅由压缩过程中达到的平衡程度来描述，而这个程度决定了两种模式之间的转换，从而可以将两种过程的相应活化能归一化到一条主曲线。 显示英文摘要

摘要： Any property of metallic glasses is controlled by the microscopic ongoing relaxation processes. While the response of these processes to temperature is well documented, little is known on their pressure dependence, owning to non-trivial experimental challenges. By combining fast differential scanning calorimetry, X-ray diffraction and high-pressure technologies, we identify the origin of a recently discovered pressure-induced rejuvenation in metallic glasses from the different pressure response of the $\alpha$- and $\beta$-relaxation in a series of hydrostatically compressed Vit4 glasses. While the localized $\beta$-relaxation promotes rejuvenation and is associated to a constant looser atomic packing independent of the applied pressure, the collective $\alpha$-relaxation triggers density driven ordering processes promoting the stability. The latter parameter however cannot be solely described by the degree of equilibration reached during the compression, which instead determines the crossover between the two regimes allowing to rescale the corresponding activation energies of the two processes on a master curve.